I have done this:
https://wiki.mobileread.com/wiki/Kind...-Amazon_eBooks
Using my tool:
https://www.mobileread.com/forums/sho...67#post2010967
And my books are synching fine between my Amazon Kindle Keyboard and my Android devices.
However, I load the same .mobi file into my iPod Touch and it won't even attempt to sync. Has anyone had this and solved it?